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Responsive Metasurface for Directional Control of Laser and Thermal Emission Dynamic Regulation.

Mengqi Zhang1,2, Pan Wang1,2, Xianghui Liu1

  • 1State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary

This study presents a novel metasurface for independent control of near-infrared (NIR) lasers and mid-infrared (MIR) light. This breakthrough enables advanced multispectral adaptive camouflage and anti-counterfeiting applications.

Keywords:
anti‐counterfeitingdirectional reflection controldynamic thermal emission regulationmultispectral adaptive camouflageresponsive metasurface

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Electromagnetics

Background:

  • Responsive metasurfaces offer efficient control over electromagnetic waves for energy and information applications.
  • Simultaneous, non-interfering manipulation of near-infrared (NIR) and mid-infrared (MIR) spectral regions with spatial and spectral responsiveness remains a significant challenge.
  • Existing technologies struggle with multispectral adaptive camouflage and anti-counterfeiting due to limitations in controlling different spectral bands simultaneously.

Purpose of the Study:

  • To demonstrate a multispectral responsive metasurface capable of independent modulation of MIR thermal emission and NIR laser reflection.
  • To achieve robust, spatially directional control of NIR laser reflections while dynamically modulating MIR thermal emission.
  • To explore applications in multispectral adaptive camouflage, anti-counterfeiting, and other stimulus-responsive material scenarios.

Main Methods:

  • Fabrication of a novel multispectral responsive metasurface.
  • Utilizing NIR reflection splitting for precise laser control.
  • Employing a photonically amplified metal-insulator transition for thermal emission modulation.
  • Experimental validation under fluctuating thermal environments.

Main Results:

  • Achieved ultralow specular reflectivity of 0.049 in the NIR region (0.8-1.2 µm).
  • Demonstrated high thermal emission regulation capability of 0.51 in the MIR region (8-13 µm).
  • Successfully realized temperature-invariant NIR laser control and dynamic MIR camouflage, outperforming existing technologies.
  • Showcased dual-mode information anti-counterfeiting via independent detection angle and temperature responses.

Conclusions:

  • The developed metasurface enables independent spatial and spectral control of NIR and MIR electromagnetic waves.
  • This technology provides a new pathway for advanced multispectral adaptive camouflage and anti-counterfeiting solutions.
  • The findings pave the way for diverse applications utilizing stimulus-responsive materials with tailored spectral and spatial modulation capabilities.